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          Java基础数据类型
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        <h2 id="数据类型"><a href="#数据类型" class="headerlink" title="数据类型"></a>数据类型</h2><h3 id="整数类型"><a href="#整数类型" class="headerlink" title="整数类型"></a>整数类型</h3><ul>
<li>byte  8bit 对应包装类 Byte  </li>
<li>short 16bit 对应包装类 Short</li>
<li>int  32bit 对应包装类 Integer</li>
<li>long  64bit 对应包装类 Long</li>
</ul>
<h3 id="浮点类型"><a href="#浮点类型" class="headerlink" title="浮点类型"></a>浮点类型</h3><ul>
<li>float  32bit 对应包装类 Float</li>
<li>double  64位 对应包装类Double</li>
</ul>
<h3 id="字符类型"><a href="#字符类型" class="headerlink" title="字符类型"></a>字符类型</h3><ul>
<li>char 根据编码类型确定大小 对应包装类 Character</li>
</ul>
<h3 id="布尔类型"><a href="#布尔类型" class="headerlink" title="布尔类型"></a>布尔类型</h3><ul>
<li>boolean  32位 对应包装类 Boolean</li>
</ul>
<h3 id="数值类型之间的合法转换"><a href="#数值类型之间的合法转换" class="headerlink" title="数值类型之间的合法转换"></a>数值类型之间的合法转换</h3><p><img src="https://image-1305623006.cos.ap-nanjing.myqcloud.com/image-20220212123629557.png" alt="image-20220212123629557"></p>
<h3 id="包装器类-x2F-自动拆装箱"><a href="#包装器类-x2F-自动拆装箱" class="headerlink" title="包装器类&#x2F;自动拆装箱"></a>包装器类&#x2F;自动拆装箱</h3><p><strong>为什么要有包装器类？</strong></p>
<p>Java是一门面向对象的语言，但是八个基本类型却不能以对象的形式出现，但有时我们需要这些基本类型出现，比如集合List的&lt;&gt;中参数类型不能是基本类型，所以就出现了包装类，让基本类型也能转换成对象。</p>
<h4 id="自动装箱"><a href="#自动装箱" class="headerlink" title="自动装箱"></a>自动装箱</h4><p>当我们使用一个要求类型为Integer的集合去添加一个int类型的数值时如</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">List&lt;Integer&gt; l = <span class="keyword">new</span> <span class="title class_">ArrayList</span>&lt;&gt;();</span><br><span class="line">l.add(<span class="number">1</span>);</span><br></pre></td></tr></table></figure>

<p>此时实际执行的方法是</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">l.add(Integer.valueOf(<span class="number">1</span>));</span><br></pre></td></tr></table></figure>

<p>这就是自动装箱，把基本类型自动转换为对应的包装类对象。</p>
<h4 id="自动拆箱"><a href="#自动拆箱" class="headerlink" title="自动拆箱"></a>自动拆箱</h4><p>当我们将包装类对象赋给对应基本类型的变量时，也会进行自动拆箱</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">int</span> <span class="variable">a</span> <span class="operator">=</span> l.get(i)</span><br></pre></td></tr></table></figure>

<p>此时进行的操作其实是</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">int</span> <span class="variable">a</span> <span class="operator">=</span> l.get(i).intValue();</span><br></pre></td></tr></table></figure>

<h4 id="128陷阱"><a href="#128陷阱" class="headerlink" title="128陷阱"></a>128陷阱</h4><p>当我们在使用“&#x3D; &#x3D;”运算符进行比较时，我们知道 “&#x3D; &#x3D;”运算符比较的是值的大小，对于基本数据类型来说比较的就是基本数据类型变量的值，而对于引用类型变量来说对比的是堆中的地址是否相同，什么是128陷阱呢，以Integer类型的对象举例</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">   <span class="type">Integer</span> <span class="variable">a</span> <span class="operator">=</span> <span class="number">1</span>;</span><br><span class="line">   <span class="type">Integer</span> <span class="variable">b</span> <span class="operator">=</span> <span class="number">1</span>;</span><br><span class="line">   <span class="type">Integer</span> <span class="variable">a1</span> <span class="operator">=</span> <span class="number">128</span>;</span><br><span class="line">   <span class="type">Integer</span> <span class="variable">b1</span> <span class="operator">=</span> <span class="number">128</span>;</span><br><span class="line">   System.out.println(a == b);</span><br><span class="line">   System.out.println(a1 == b1);</span><br><span class="line">··································&gt;</span><br><span class="line">    执行结果：</span><br><span class="line">    <span class="literal">true</span></span><br><span class="line">    <span class="literal">false</span></span><br></pre></td></tr></table></figure>



<p>出现这种情况的原因是，在Integer源码中，有一个cache数组，这个数组已经初始化好了，当我们在调用valueOf（）方法进行自动装箱时，如果需要装箱的数值在-128 - 127之间那么，会直接从cache数组中返回数据，而超出了范围则会new 一个新的Integer对象，所以就出现了上面两种结果的不同。</p>

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